Perera, HGunatunge, C2014-01-202014-01-202004-04Perera H, Gunatunge C. Screening for mental health problems in urban preschool children – a pilot study. Sri Lanka Journal of Child Health. 2004 Apr-June; 33(2): 39-42.http://imsear.searo.who.int/handle/123456789/150165enPreschool childrenmental health problemsepidemiologyurbanArticle